I had made a post the day before the Finale saying that with a little metaphorical duct tape and WD40 they could fix anything wrong with the LOST universe.
So when they literally whipped out the duct tape I was ROFL.
I don't read contemporary Sci-Fi, but when I was young I read almost all the classic Sci-Fi written between the 40's and the mid 60's. Great stuff. So I've read a lot of classic time travel stories, and the time travel didn't bother me.
The happy departure lounge ending, blech. Sappy. Hated the idea that Hurley who died whenever had been hanging around waiting for someone who died long before him to figure out he was dead. In 2004 LA. Stupid stupid illogical idea of afterlife limbo.
Jack dying, that was emotional for me, and for some reason, the Sawyer Juliet reunion got me.